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西宁市位于湟水河谷,其南北两山水土流失面积大而严重,灾害频繁,暴雨、洪水和泥石流灾害时有发生。绿化南北山改善生态环境的任务十分艰苦。"五库四山"灌溉工程是实现南北山绿化的关键性工程措施,对推动南北两山生态治理具有重要意义。文章从水利灌溉工程建设的角度对加强西宁市南北两山生态治理进行了阐析。 相似文献
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"5·12"四川汶川大地震导致灾区地质灾害危险性大大增强,严重影响了周边居民的生命财产安全。都江堰市虹口乡红色干沟泥石流灾害隐患点是其中之一。根据泥石流的成因、类型、规模,以及泥石流的活动特征,对泥石流活动进行了危险性评估,指出泥石流防治工程方案应采用以排为主,适当拦挡的原则,建拦挡坝用以消能、调节泥石流流量;建防护堤用以限制泥石流漫流,对居民区进行有效防护。 相似文献
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郭家沟、大崖沟的泥石流曾多次对下游的居民造成危害,本文通过对两沟地形、固体物源、水源等泥石流形成条件的分析,提出相应的灾害防治方案。 相似文献
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化隆县位于青海东部,东与民和县相连,东南和南方与循化、尖扎隔河相望,西与贵德、湟中接壤,西北和北面与平安、乐都相邻。土地面积2740平方公里,占全省总面积的0.38%。本区除石质高山外,主要为黄土与红色砂岩覆盖的中低山和丘陵地区,且多暴雨,极易发生泥石流灾害。本文通过对化隆甘都东滩泥石流发生的地理环境、危害情况的调查,为泥石流的防治提供科学依据。东滩泥石流灾害调查 1989年7月20日晚20时至21时,化隆县有14个乡镇的124个村庄,5009户受灾,毁坏房屋近1900间,使2400余人无家可归。农作物受灾面积达1800公顷,损失粮油383.9万公斤,造成经济损失达416.4万元。被泥石流冲毁而难以恢复的耕地68公顷,淹没耕地152公顷。冲毁成片林134公项,林业经济损失450万元。这次灾害各类损失达2000余万元。距化隆县城南偏东约25.5公里处的甘都镇,是全县受灾最重的乡镇。全镇受灾总户数达1205 相似文献
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近年来,随着社会经济的发展,人类工程活动频繁,泥石流地质灾害在我市每年新增灾害中占有相当大的比重,严重威胁着人民的生命财产安全。秦皇岛市泥石流主要发育在北部低山丘陵区,规模小,危害大。通过对泥石流发育特征的研究,阐明其形成条件与地形、地质环境、植被和降雨等因素的关系,并据此提出了群测群防,加强采矿活动正确管理、工程治理等防治措施。 相似文献
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山地沟槽或河谷暂时性水流与其流域内大量土石互相作用的洪流过程和现象,称为泥石流或山洪泥流、泥石洪流.青海省是泥石流地质灾害多发的省份之一.特别是1994年6—7月初,果洛州久治县、互助县五十乡、湟源县、尖扎县、玉树州结古镇、湟中县、民和县等局部地区因降暴雨,形成不同程度的泥石流灾害.其中互助县五十乡遭受百年未遇的特大暴雨泥石流,10个行政村被冲毁.上述地区造成死亡23人,直接经济损失2500多万元. 相似文献
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循化县城座落于青海省东部、循化盆地黄河南岸河谷阶地上,地形平坦。县城南侧所倚南山为红层丘陵,地形破碎,坡面侵蚀强烈,水土流失严重,泥石流灾害频发,已严重地影响了循化县城环境和生活、生产秩序。本文通过对泥石流特征及危害史的分析,提出了工程防治对策。 相似文献
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从八十年代的森林砍伐,到近几年的开矿、大规模修水电站,舟曲的生态环境已经脆弱不堪,越来越频繁的泥石流就是大自然给舟曲的警告。 相似文献
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Trametes versicolor decolorized 2000 mg L(-1) of the mono-azo substituted naphthalenic dye Amaranth with no dye sorption observed visually. The changes in the toxicity were assessed over a period of 30 d for the dye-treated viable culture, control (no dye added), and a boiled culture treated with dye, using the Microtox Acute Toxicity assay. Before dye addition, the culture filtrate had some toxicity, which increased after the dye addition. The toxicity of the dye-treated culture decreased during the treatment. The loss of toxicity occurred at the same time, with the loss of color suggesting that detoxification is associated with decoloration. The change in pH was due to natural metabolic processes and had a small effect on detoxification. Because the toxicity of the treatment was similar to that of the control at the end of the treatment, the effluent seems to be safe for release into the environment, potentially rendering this treatment suitable for industrial application. 相似文献
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泵站树状给水管网流量具有随机性,而这种随机性变化会直接影响管网的建设费用和动力费用.针对这-特点,应用随机规划原理,建立泵站树状给水管网机会约束模型,编写基于随机模拟的遗传算法程序求解该模型.机会约束模型能较客观地反映该管网的实际工况,使优化设计结果更符合实际. 相似文献
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城镇化是推动我国经济社会发展的重要动力,在高速发展的同时,带来大量污染排放,威胁乡村环境质量与可持续发展。在对乡村生态环境问题剖析的基础上,从战略、实施、方式等层面探索解决思路,围绕科学规划、发展方式、基础建设、管理机制、宣传教育等方面分析关键点,加强乡村环境保护,保障城镇化建设健康发展,为促进农村农业持续发展提供持久动力。 相似文献
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Günay Kocasoy 《Environmental management》1989,13(4):469-475
The increase in the number of tourists visiting a coast is desired by most of the countries for economic reasons. However, this increase in tourism may cause pollution of the sea. This can be only avoided by proper planning and by predicting the carrying capacity of the coast in terms of sea pollution. This is especially important for developing countries where part of the wastewater is discharged without any treatment into the sea.In the present study the beaches were classified according to their use — and consequently the amount of waste discharged into the sea — into four groups: (1) coasts that are used only for swimming and recreational purposes; (2) coasts used simultaneously for dwelling, swimming, and recreational purposes; (3) coasts along which only dwellings exist; and (4) natural and man-made harbors, i.e., coasts used as shelters. During the survey,40,320 observations were made between December 1985 and February 1988 to determine the effect of the number of tourists on seawater quality. The results obtained were analyzed by a multilinear regression program to obtain an empirical equation giving the extent of the sea pollution in terms of coliform concentration as a function of population density and some other environmental factors.The equations derived in this study enable the determination of the carrying capacity of a beach in terms of pollution as well as the expected degree of pollution corresponding to a given population density. Furthermore, it allows the prediction of the extra carrying capacity that can be obtained by improving the waste-disposal conditions. 相似文献
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阐释了信息产业专门化街区的内涵,结合对合肥市黄山路信息产业专门化街区构成要素的分类及其邻近度的分析,分别从空间结构演化、景观演化、功能演化三方面阐述了合肥市黄山路由"电子一条街"向"信息产业专门化街区"的总体演化阶段,探讨了信息产业专门化街区的未来发展趋势。 相似文献
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燃煤二氧化硫控制技术应用概况 总被引:1,自引:0,他引:1
由燃煤引起的二氧化硫污染已成为大气环境中最主要的污染因子。为解决这个问题,我国结合国外的技术成果,进行了各种脱硫技术的研究。介绍了各种治理技术应用情况,并结合实际经验对其中应注意的问题给予评述。 相似文献